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churin
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How to reset no boot W10

Tue May 22, 2018 9:21 pm

How can I reset W10(v.1803) which cannot boot?
 
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Re: How to reset no boot W10

Tue May 22, 2018 9:23 pm

churin wrote:
How can I reset W10(v.1803) which cannot boot?

You're gonna need to provide a lot more info about the circumstances and symptoms of this situation, unless you want us to just tell you to do a full OS reinstall from scratch.
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churin
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Re: How to reset no boot W10

Tue May 22, 2018 11:57 pm

I clean installed W10 Pro-v.1607 on 100GB partition in 250GB SSD. I do not remember whether the partition was created before the installation or during the installation. The system was updated up to v.1803. I noticed there there was 450MB partition following the 100GB system partition, which I did not remember when and how it was created. I deleted the 450MB partition and enlarged the system partition using the third party utility(Partition Master), thereafter the system became not bootable.

I tried the repair option after booting from USB W10 install media but found that reset option was not available.

If the system is repairable, that would be more desirable but I could not any way to do it.
 
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Re: How to reset no boot W10

Wed May 23, 2018 12:04 am

churin wrote:
I clean installed W10 Pro-v.1607 on 100GB partition in 250GB SSD. I do not remember whether the partition was created before the installation or during the installation. The system was updated up to v.1803. I noticed there there was 450MB partition following the 100GB system partition, which I did not remember when and how it was created. I deleted the 450MB partition and enlarged the system partition using the third party utility(Partition Master), thereafter the system became not bootable.

I tried the repair option after booting from USB W10 install media but found that reset option was not available.

If the system is repairable, that would be more desirable but I could not any way to do it.

You deleted the Recovery and System partitions that Windows creates when it installs. Do not do this. Was 450MB really that important?

You're likely going to have to do a clean install.
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Re: How to reset no boot W10

Wed May 23, 2018 12:52 am

- do a low level backup / clone of the 100G partition
- delete and recreate and 100G partition. make it 100G + 500M in size
- reinstall windows, let it recreate the 500M system partition again
- restore the clone image back to the 100G partition
that should do it

deleting that 500M partition was a big nono. it's a lot of work recreating it
 
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Re: How to reset no boot W10

Wed May 23, 2018 12:57 am

LocalCitizen wrote:
- do a low level backup / clone of the 100G partition
- delete and recreate and 100G partition. make it 100G + 500M in size
- reinstall windows, let it recreate the 500M system partition again
- restore the clone image back to the 100G partition
that should do it

deleting that 500M partition was a big nono. it's a lot of work recreating it

Goodness gracious man, just reinstall Windows on the 100GB partition again. WIndows will take care of the formatting. No need for all this work.
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Re: How to reset no boot W10

Wed May 23, 2018 3:08 am

Boot into WindowsPE
Confirm that the C: drive hold the Windows directory.
bcdboot c:\windows

This is the sloppy fix, but it should work.
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Re: How to reset no boot W10

Wed May 23, 2018 5:53 am

if you already have spent the time to configure the win10 just the way you like it, then it's faster to spend 10 minutes to clone and restore. if you just made a clean install then reinstall doesn't take much longer.
 
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Re: How to reset no boot W10

Wed May 23, 2018 11:59 am

Not sure what you expected to happen when you deleted a partition that was put there by the system installer. It doesn't just create partitions for no reason.
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churin
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Re: How to reset no boot W10

Wed May 23, 2018 3:47 pm

Thank you all for your replies.
Ryu Connor wrote:
Boot into WindowsPE
Confirm that the C: drive hold the Windows directory.
bcdboot c:\windows

This is the sloppy fix, but it should work.

I tried the above suggestion and got "Boot files successfully created" message after executing the suggested command. But the Windows 10 is still no boot.
This is a desirable solution if it works since it avoid wiping out installed application softwares. Any further suggestions?
 
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Re: How to reset no boot W10

Wed May 23, 2018 3:56 pm

Time to go all Ripley on that box.
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Re: How to reset no boot W10

Wed May 23, 2018 4:12 pm

DancinJack wrote:
You deleted the Recovery and System partitions that Windows creates when it installs. Do not do this. Was 450MB really that important?

You're likely going to have to do a clean install.
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Re: How to reset no boot W10

Wed May 23, 2018 4:26 pm

I'd try to recreate the partition you deleted with a program such as TestDisk.

Edit: If you don't have a backup, learn from this experience and have one from now on.
 
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Re: How to reset no boot W10

Wed May 23, 2018 5:09 pm

DancinJack wrote:
Goodness gracious man, just reinstall Windows on the 100GB partition again. WIndows will take care of the formatting. No need for all this work.


The problem is that the boot partition needs to be at the beginning of the disk, and there is no easy way to push the system volume over since he extended it.

Best option is a backup/reinstall/restore with a backup or imaging application. But it can be done without additional software: Create another partition (temporarily) on on the 250 GB disk, copy files over, nuke the original partition, reinstall Windows, and then copy data back from the temp partition.

And, for future reference, all versions of Windows after XP create a boot partition. The size ranges from 150-500 MB depending on the OS. It is not optional. In some cases, you may be able to shrink it a bit, but that's not a good idea either. Some features like Credential Guard, Bitlocker, etc require space on that partition if they are enabled.
 
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Re: How to reset no boot W10

Wed May 23, 2018 6:14 pm

Sorry to be a little OT. I had a situation recently where the recovery/boot partition suddenly had a drive letter attached to it, which was not removable from Disk Management. Fortunately, it received drive letter D: even though C: lay beyond D: on the same drive. Windows booted fine into C:, but would incessantly b!tch about low space on D:

Tangent complete.
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Re: How to reset no boot W10

Wed May 23, 2018 7:06 pm

churin wrote:
Thank you all for your replies.

I tried the above suggestion and got "Boot files successfully created" message after executing the suggested command. But the Windows 10 is still no boot.
This is a desirable solution if it works since it avoid wiping out installed application softwares. Any further suggestions?


Hmm. I think I know what's happening. I'm guessing your system is using UEFI boot, GPT partitions, and your C: drive is NTFS. That won't work, winload.efi can't launch from NTFS.

Boot into WindowsPE
Use Diskpart to shrink the partition by 100MB.
Create a 100MB EFI System Partition using Diskpart.
Format it in FAT32.
Assign a drive letter
Run the bcdboot command.

https://docs.microsoft.com/en-us/window ... partitions
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Re: How to reset no boot W10

Wed May 23, 2018 7:26 pm

Reinstall from scratch. It's the easiest method to ensure you don't have trouble in the future. Also, stop screwing around with things you don't understand unless you have a good backup strategy first. :)
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Re: How to reset no boot W10

Wed May 23, 2018 7:36 pm

TheRazorsEdge wrote:
all versions of Windows after XP create a boot partition. The size ranges from 150-500 MB depending on the OS. It is not optional. In some cases, you may be able to shrink it a bit, but that's not a good idea either. Some features like Credential Guard, Bitlocker, etc require space on that partition if they are enabled.
I've never let Windows (up to W8) create its funny partitions. Though, never used Bitlocker.
 
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Re: How to reset no boot W10

Wed May 23, 2018 7:44 pm

meerkt wrote:
TheRazorsEdge wrote:
all versions of Windows after XP create a boot partition. The size ranges from 150-500 MB depending on the OS. It is not optional. In some cases, you may be able to shrink it a bit, but that's not a good idea either. Some features like Credential Guard, Bitlocker, etc require space on that partition if they are enabled.

I've never let Windows (up to W8) create its funny partitions. Though, never used Bitlocker.

There's no getting around it if you're on a system that uses EFI boot. By definition, EFI needs a FAT32 boot partition.
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Re: How to reset no boot W10

Wed May 23, 2018 8:37 pm

meerkt wrote:
TheRazorsEdge wrote:
all versions of Windows after XP create a boot partition. The size ranges from 150-500 MB depending on the OS. It is not optional. In some cases, you may be able to shrink it a bit, but that's not a good idea either. Some features like Credential Guard, Bitlocker, etc require space on that partition if they are enabled.
I've never let Windows (up to W8) create its funny partitions. Though, never used Bitlocker.


Anecdotes aren't useful when you're an outlier doing weird things to your computer. Especially when you don't recognize you're an outlier doing weird things to your computer.
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Re: How to reset no boot W10

Wed May 23, 2018 8:54 pm

MOSFET wrote:
Sorry to be a little OT. I had a situation recently where the recovery/boot partition suddenly had a drive letter attached to it, which was not removable from Disk Management. Fortunately, it received drive letter D: even though C: lay beyond D: on the same drive. Windows booted fine into C:, but would incessantly b!tch about low space on D:

Tangent complete.


Tried using diskpart? If you need local system permissions you can run it with psexec -s -i.
 
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Re: How to reset no boot W10

Wed May 23, 2018 10:15 pm

Waco wrote:
Reinstall from scratch. It's the easiest method to ensure you don't have trouble in the future. Also, stop screwing around with things you don't understand unless you have a good backup strategy first. :)

The reason I have suggested this multiple times now is the OP deleted the system and recovery partitions not knowing what was going on with them. I just don't see how diving into diskpart, cloning, and recreating partitions is a good idea in this case.

Anyway, obviously, I agree with you Waco. Just reinstall clean and be done with it.
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Re: How to reset no boot W10

Wed May 23, 2018 11:35 pm

meerkt wrote:
I've never let Windows (up to W8) create its funny partitions. Though, never used Bitlocker.


You're wrong. I don't know what else to tell you.

The Windows installer will create those partitions automatically. Even if you pick a blank hard drive and click through the installer without creating any partitions.

You may think you don't have it. Some partitioning tools will not display special partition types. This includes some Windows utilities. But you can always verify by running DISKPART. (DISKPART is the same utility that the installer executes.)

E.g.,

diskpart
list disk
select disk 0
list volume


After the "list disk" command, you'll have to identify your boot disk if you have more than one HD and select the right number in the next line. I used "0" because on 99/100 systems, the C:\ is disk 0. There will be 1-2 "Hidden" partitions listed depending on the OS and 1 "System" partition.

Now you know.
 
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Re: How to reset no boot W10

Thu May 24, 2018 7:37 am

TheRazorsEdge wrote:
The Windows installer will create those partitions automatically. Even if you pick a blank hard drive and click through the installer without creating any partitions.

I've certainly forced Windows 7 to use a single partition, by partitioning first and then telling Windows to install in that partition. This was with BIOS/MBR, though.
 
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Re: How to reset no boot W10

Thu May 24, 2018 7:38 am

Yeah, I'm not talking about EFI. And on GPT, I guess Microsoft's reserved partition is optional. Anyway, Win8 is fine with non-EFI booting (and MBR).
 
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Re: How to reset no boot W10

Thu May 24, 2018 8:57 am

I think there seems to be a lot of confusion here about these partitions.

First of all the EFI system partition. This is a mandatory partition on UEFI systems. This is a FAT32 partition with a special flag which tells the firmware that it is a EFI System partition. UEFI OS loader applications (among otherthings) are stored on here.

For Windows 7 and later, on GPT or MBR hard disks, if you install to an unpartitioned drive (or a drive with just the EFI system partition) or unpartitioned space, Windows will create the boot partition and your If main C drive. If you make your own partition and select that in the installer, windows will install to that, and not create the extra partition.
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Re: How to reset no boot W10

Thu May 24, 2018 9:46 am

srg86 wrote:
I think there seems to be a lot of confusion here about these partitions.

Except for the OPs initial confusion, I don't agree.
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Re: How to reset no boot W10

Thu May 24, 2018 7:26 pm

TheRazorsEdge wrote:
You're wrong. I don't know what else to tell you.

The Windows installer will create those partitions automatically. Even if you pick a blank hard drive and click through the installer without creating any partitions.


You can use an unattended install or use shift+F10 during a manual install to access diskpart. Diskpart can create an MBR disk that is a singular giant partition. You can then direct the installer to place Windows on your created partition. This will install Windows without creating a system partition (boot files) or a recovery partition (winre).

Meerkt has likely done this, he's fairly technical, it aids him in his adventures.
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Re: How to reset no boot W10

Thu May 24, 2018 7:34 pm

Ryu Connor wrote:
Meerkt has likely done this, he's fairly technical, it aids him in his adventures.

This just struck me as insanely funny for some reason. Yes, I'd say many of us embark on "technical adventures" from time to time... :lol:

(My day job probably qualifies too...)
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Re: How to reset no boot W10

Thu May 24, 2018 7:49 pm

Just because you can doesn't mean you should. :P
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